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Why does my computer keep shutting down on its own?

Answer

Random computer shutdowns are caused by either an overheating processor or a failure in the operating system. Fixing an operating system's registry fixes many random shutdown issues. For a potentially overheating processor, verify that a computer's fan is spinning at a consistent rate and that it is free from dust.

Registry errors are caused by installing, uninstalling and removing software from a computer. Some pieces of software overrule others, causing conflicts in how the system is told to operate. Running a registry cleaner can fix inconsistencies, preventing registry errors from causing random shutdowns. Take care to back up the registry as-is, however, just in case the software breaks the functionality of some of the programs. Not all registry cleaners are created equal and many others are paired with dubious promises.

For overheating issues, check to make sure that the fan is clean, spins freely and varies its RPMs with the workload and internal temperature of your computer. A computer's task manager reports the internal temperature of a computer. The more open and running programs, the higher the temperature gets. Remove the computer case, and verify that the interior is clean. Do not use canned air to clean the fan and heat-sink areas. This forces dirt and dust into the sensitive areas of the computer. Instead, use a vacuum hose with a narrow nozzle, taking care not to disturb or touch any of the internal components.

Q&A Related to "Why does my computer keep shutting down on its..."
Age can cause a laptop battery to not charge fully. If the computer is not fully charged it can cause it to shut down prematurely if the laptop is not plugged into an outlet. Excessive
http://www.ehow.com/facts_7567119_acer-keep-shutti...
If your pc gets too hot and overheated, that can cause the pc to auto shutdown on its own. Make sure all fans are circulating fine and that your hard drive is not corrupted. Most
http://answers.yahoo.com/question/index?qid=201304...
It could be RAM problem or registry corrupt. To fix registry error, you can run ErrorFix. http://www.make-pc-faster.com/ Also you can reffer to Overheating and virus.
http://wiki.answers.com/Q/Why_does_your_computer_k...
Sounds like one of three things. BIOS settings, Overheating, faulty Power supply unit. Could be bad BIOS settings, usually RAM voltage or MCH voltage not being correct. Read the manual
http://answers.yahoo.com/question/index?qid=200906...
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